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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Total operating revenues $ 2,369.0 $ 2,362.6 $ 1,784.2
Cost of Product and Service Sold 1,629.7 1,760.9 1,543.6
Loss on impairment 27.3 0.0 0.0
Depreciation 146.3 122.1 101.1
General and administrative 97.1 116.3 99.3
OPERATING INCOME 477.0 352.3 53.5
Nonoperating Income (Expense) (75.3) (17.9) (30.7)
Total provision for income taxes (426.8) 0.4 (782.6)
NET INCOME ATTRIBUTABLE TO VALARIS 982.8 373.4 865.4
ASSETS      
Cash and cash equivalents 599.4 368.2  
Other 144.7 139.3  
TOTAL ASSETS 5,304.8 4,419.8  
Liabilities [Abstract]      
Liabilities, Current 691.6 679.5  
Liabilities 2,133.1 2,175.5  
Total assets 438.5 368.9  
Investment Owned, Balance [Abstract]      
EQUITY IN EARNINGS (LOSSES) OF ARO 8.4 (11.0) 13.3
ARO      
Related Party Transactions [Abstract]      
Lease Revenue From Related Party 69.4 52.6 69.2
ARO      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]      
Total operating revenues 571.0 512.5 496.6
Cost of Product and Service Sold 360.7 367.7 365.9
Loss on impairment 0.0 28.4 0.0
Depreciation 114.9 89.2 65.9
General and administrative 28.8 23.7 22.2
OPERATING INCOME 66.6 3.5 42.6
Nonoperating Income (Expense) 59.5 55.5 31.8
Total provision for income taxes 15.7 (4.8) 8.3
NET INCOME ATTRIBUTABLE TO VALARIS (8.6) (47.2) 2.5
ASSETS      
Cash and cash equivalents 99.3 50.0  
Other 148.3 127.7  
Assets, Noncurrent 1,266.1 1,291.1  
TOTAL ASSETS 1,513.7 1,468.8  
Liabilities [Abstract]      
Liabilities, Current 139.0 146.6  
Liabilities, Noncurrent 1,263.8 1,202.7  
Liabilities 1,402.8 1,349.3  
ARO | Assets, Total      
Liabilities [Abstract]      
Total assets 516.6 426.1  
ARO | Liabilities, Total      
Liabilities [Abstract]      
Total assets 78.1 57.2  
ARO      
Investment Owned, Balance [Abstract]      
50% interest in ARO net income (loss) (4.3) (23.6) 1.3
Amortization of basis differences 12.7 12.6 12.0
EQUITY IN EARNINGS (LOSSES) OF ARO $ 8.4 $ (11.0) $ 13.3